Seagate and Western Digital Are a Hard Disk Drive Duopoly. Barchart Ranks the Storage Stocks Here.

The hard disk drive (HDD) industry may sound old-school in a world obsessed with chips and artificial intelligence (AI) models, but behind the scenes, it is quietly powering the rapid data surge. Every AI query, cloud application, or enterprise workload needs massive storage, and that is where HDDs still dominate, handling nearly 80% of global cloud storage demand. As AI scales, so does the need to store vast amounts of data in a cost-effective and efficient way, turning this once-cyclical sector into a key beneficiary of the AI spending boom.

So, at the center of this shift sits a tight duopoly - Seagate Technology Holdings plc (STX) and Western Digital Corporation (WDC). Together, they control the bulk of the HDD market, supplying storage solutions to hyperscalers, enterprises, and data centers worldwide. With limited competition and disciplined supply, both players are now in a sweet spot, where pricing power and demand are moving in their favor.